Tag: relational
More distributed key/value storage options
by maggie on Jul.14, 2009, under entry
CouchDB has infected me and I’ve been reading a lot about alternative ways to store data AND organize it. In the midst of options for alternatives to relational databases, these two stand out:
Cassandra – “Cassandra is a highly scalable, eventually consistent, distributed, structured key-value store. Cassandra brings together the distributed systems technologies from Dynamo and the data model from Google’s BigTable. Like Dynamo, Cassandra is eventually consistent. Like BigTable, Cassandra provides a ColumnFamily-based data model richer than typical key/value systems.”
The huge appeal of Cassandra seems to be the approach to make it highly fault-tolerant. Writes never fail. Data is always available. No single point of failure. If you’re making a Twitter-like app, you should consider it.
Tokyo Cabinet – “Tokyo Cabinet uses hash algorithm to retrieve records. If a bucket array has sufficient number of elements, the time complexity of retrieval is “O(1)”. That is, time required for retrieving a record is constant, regardless of the scale of a database. It is also the same about storing and deleting. Collision of hash values is managed by separate chaining. Data structure of the chains is binary search tree. Even if a bucket array has unusually scarce elements, the time complexity of retrieval is “O(log n)”.”
Tokyo Cabinet is slightly newer and is apparently stupidly fast, faster than any other storage solutions out there (at least for now). It’s written in C and provided as API of C, Perl, Ruby, Java, and Lua.
Do you know anyone who has used these two already? Care to share your experiences?
ORM in the PHP World
by maggie on May.21, 2009, under entry
Yesterday I gave a talk at the php|tek 2009 Conference about the ORM in the PHP World. In the first part of the presentation, I’m focusing on what an ORM is, what would make a great ORM, design patters for ORM and tying ORM systems to the PHP world in terms of philosophy, uses and approaches. The second part of the presentation talks about a list of ORMs that I have seen and their pros and cons.
The ORMs I mention:
- Propel
- Doctrine
- dOrm
- Zend Framework – specifically the proposed Zend_Db_Mapper
- Xyster Framework
- CodeIgniter
- ez components’s Persistent Object and Persistent Mapping
- symfony
- PHPLinq
- Solar’s Solar_Sql_Model
- Outlet PHP ORM
- CoughPHP
- ORMer
I plan on talking about each of these ORMs in detail in separate blog posts, so stay tuned!
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